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The resistance of 20Cr/25Ni steels to carbon deposition. III. Cold work and selective pre‐oxidation
Author(s) -
Holm R. A.,
Evans H. E.
Publication year - 1987
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19870380502
Subject(s) - tin , metallurgy , deposition (geology) , alloy , materials science , carbon fibers , substrate (aquarium) , oxide , chemistry , chemical engineering , composite material , geology , engineering , paleontology , oceanography , sediment , composite number
Specimens of annealed 20 Cr/25Ni/Nb, selectively pre‐oxidised 20Cr/25Ni/Nb, cold worked 20Cr/25Ni/Nb and TiN‐strengthened 20Cr‐25Ni steels have been exposed to a 75% CO/CO 2 gas atmosphere for periods up to 2000 hrs at 923 K (650°C). Whereas the cold‐worked and TiN‐strengthened steels show high resistance to this environment, the annealed Nb‐stabilised alloy exhibited large amounts of carbon deposition. Associated with these were extensive regions of oxide pitting and gross carburisation of the substrate. By contrast, the selectively preoxidised specimens suffered much less deposition and no evidence for carburisation was found. It was also shown that small quantities of defects in the original preoxidised layer increased the propensity for deposition but did not result in local carburisation.